Power-transmitting mechanism



Aug. 10 1926.

' J. C. BARRETT rowan TRANSMITTING mscrmmsm Filed April 10, 1922 3Sheets-Shaot 1 INVENTOR I Jfis 636M622? BY/W ATTORNEY Aug. 10 1926.

J. C. BARRETT POWER TRANSMITTING MECHANISM Filed April 10, 1922 3Sheets-Shoat 2 INVENTOR 762! afar/65$ 8W ATTORNEY Aug. 10 192e.-1,595,064

- J. C. BARRETT POWER TRANSMITTING MECHANISM Filed April 10. 1922 3Sheets-Shoot s QQs v I INVENTOR I @w 3 Q 70:3 Q Barr'Zd BY fi/f ATTORNEYatented Aug. 10, 1926.

UNITED Lighted JOSEPH C. BARRETT, OF BROOKLYN", NEW YORK, ASSIGNOR TBULKRUG MACHINE CORPORATION, OF NEW YORK, 17. Y., A CGEEOE-ATIGN G3? NEWYORK.

P V ER-TRANSBEITTTHG MECHANISTM.

Application filed. April 10, 1922.

My invention relates to improvements in the class of power transmittingmeans set forth in U. S. Letters Patent to lVilliam Bulil, No.1,347,076, granted July 20, 1920,

6 and No. 1,349,661, granted Aug. 17, 1920,

wherein a rotative pin cooperates with a cam groove to reciprocate ablock to operate a hammer.

Qne object of my invention is to render the operation of: thereciprocative block by the pin more free and with reduced friction, andother objects are to provide improved driving means for such pin andgenerally to improve the class of mechanism referred to.

My invention comprises novel details of improvement that will be more.fully hereinafter set forth, and then pointed out in the claims.

Reference is to behad to the accompanying drawing forming part hereofwhere 1n V Figure 1 is a partly sectionalside view of a powertransmitting mechanism embodying my invention;

2 is a section substantially on line in Jig. 1; r .1 ig. 3 is atransverse section taken approximately on the irregular line 3, 3, inFig. 1;

Fig. L is a side elevation looking from the left in Fig. 1;

Fig. 5 is a detail perspective view of the cam member looking from theright hand side in Fig. 1;

6 is a view similar to Fig. 5 part being omitted;

Fig. 7 is a detail section of the crank pin member;

Fig. 8 is a'section illustrating means for operating a drill as well asa hammer, and Fig. 9 is a section on line 9, 9 in Fig. 8.

Similar numerals of reference indicate corresponding parts in theseveral views.

The numeral 1 indicates a suitable casing to contain the transmittingmechanism, and at 2 is a motor adapted to be securely attached to saidcasing, which maybe an electric-or fluid motor. The casing is shownprovided with a removablefront plate. 3 detachablyretainedbyscrews orbolts In Fig.8; the casing has a removable back plate 4 =which may. beretained'. by bolts. The casing is; also provided with. a dependingtubular guide member- 5', which may be de Serial No. 551,420.

tachably retained by bolts at 6. Within the casing is a reciprocativecam member 7 provided with a depending hammer, or plunger 8, that isguided within and by the guide 5. Hammer 8 is shown longitudinallyfluted or grooved at 8'" for the passage of air. The hammer opposes theend of a tool A within guide 5, such as a drill or riveter, the toolhaving a groove (1 receiving a spring pressed ball 10 to retain theupper end of the tool in guide 5, (Fig. 1).. The member 7 has parallelsides 7 engaging anti-friction rolls 11 ournalcd on screws 12 supportedby the casing, being shown attached to plate 3. The hammer 8 beingguided in guide 5 and the member 7 guided between rolls 11 provideseffective means for reciprocation of member 7 and the hammer withrelatively small friction. The menr her 7 is provided with a curved camslot or groove 7 within which operates a projection or crank pin 13shown extending troma crank disk 14 supported in anti-friction bearings15, 15, within casing 1. Crank-pin 13 is shown provided with ananti-friction sleeve or roll 13 to operate in slot 7. The shape ofcam-slot 7 is some what of the general character 01" the cam slot shownin the aforesaid Letters Patent. whereby when projection 13 is rotatedwithin said slot the cam member 7 will be reciprocated to reciprocatehammer '8. I make a portion or" the wall of cam slot 7 movable forcooperation with projection 13 to reduce friction and'wear between theparts, for which purpose I provide member 7 with a roller 16 shownIournaled upon a projection or stud 17 preferably formed integral withmember 7. The periphery of roller 16 is on the same, or substantiallythe same curve as surface 7 c of slot 7" both described around the axisof the roller, so that with the periphery of the roller 16- and theopposing spaced curved surface 7 the main working surfaces of cam slot 7are provided for operation of projection 13. When projection orerank pin13 is rotated with disk 14, in the direction-of the arrow in Fig. 2resistance to therotation of said projection-will be relieved byits-engagement with roller .16 which will rotate as the projectiononcrank pin travels inengagenient with the roller. During a relatively l ePei tse two-P11 ri Tot-e been of projection orcrank pin 1-3 in engageentwith the left hand side and lower portion of movable wall or roller 16as viewed in 2 retreat of member '5' with hammer 8 from the work is e'iiected, the crank-pin then being free from surface 7 and during theremainder, or nearly so, of said rotation of the crank pin it operatesagainst ca -i surface 7 to force the member and her =ner to the workwith a blow or greatly increased speed, the crank-pin then being freefrom roller 13. Thus the. crank-pin during its eccentric travelsuccessively engages the movable wall or roller 16 and the surface '4'.The cam slot is shown toiuned by means of a recess 18 formed within oneiiace of men her 7 (Figs. 5 and 6), within which recess the roller 16 isjournaled upon stud 1'? extending from a wall of said recess. As theportion of member 7 above or beyond crankpin 13 is inoperative with saidpin the slot is shown widened. so that the walls the cam-slot are freefrom the cranlopin a the moment of impact of the hammer, and metal abovemay be dispensed with, 2), since the cam slot 7 may open through theupper or outer edge of member 7. In other words, since at about themoment of impact of the hammer the crank-pin is released from cam member7 in the upper part of the cam-slot the metal beyond the cranbpin 13 maybe omitted, as distinguished from the construction shown in thestoresaid patents to Buhl.

Means are provided to rotate crank-disk 14.- at a speed reduced from hespeed of the motor shaft 2, as follows:

Disk lat has a worm gear or wheel 9-2 in mesh with a worm whose shaft 23is journalec in hearings in casing 11. The bearing 23 is detachable toadmit worm 23 to step its shaft below, (Fig. 1), at bearing 23 The worm23 e2;- tends at an angle. to the axis of member 7 and worm gear 22. Shai 23 is shown provided with a squared projection .4!) 1), to receive thecorresponding recessed end of shaft 2 or" motor 2 when the motor casingis applied to casing l. The motor casing 2 is shown secured to 1 at theend opposite guide 5, and a handle B is shown attached to the motorcasingso that the operator may press the tool. to the work bodily.Handle 13 is shown provided witi terminals or bindingposts for the lineconductors and the leads for the. motor.

In the construction described the worm gearing described is permanentlyoperative between the motor and crank disk 14., so that when the motorcircuit switch (not shown but preferably caried on handle B in anordinary way) is closed the member 7 will be reciprocated by therotation of projection 13 within its cam slot or recess.

In the form shown in Figs. 8 and 9 means are provided to operativelyconnect disk 14 with/the motor shaft and to disconnect them.

As shown in Figs. 8 and 9 the disk 14 has a hub l l journaled within asleeve 20, the outer end of which is ournaled in a bearing 1 incasing 1. Sleeve 20 carries worm gear 22. The free end of hub 14 is pro-'ded with clutch member ll" (Fig. 8) to engaged by clutch members 24? onidable members 24: within sleeve 20. The utch member 2% is rotative bysleeve 20 y means of one or more studs or screws 25 extending frommember 24 and operative in corresponding slots 2O insleeve. 20, (Fig.8). The inner ends of said studs or screws ere project within a bore inmember 24- to engage a groove 50 in a head 50 Sli able in said bore. Thestem 26 of head 50 projects through a beari g 2? in casing 1 in positionto enable its outer end to be grasped. The stem 26 is provided withannular grooves 26 to receive a stop 29, shown in the form a ball,pressed by spring 30 against stem v i hen the parts are in the positionshown in Fig. 8 the tool will be idle. hen clutch members 14*, Zi are inengagement the sleeve 20, through studs 25 and said clutch members, willrotate disk 14 and crank pin 13 to actuate cam member 7. When stem 26 ispulled outwardly said clutch members will be disengaged to permit motor2 to continue to rotate without operating cam member 7.

A further feature of my invention is that the machine may be providedwith means for rotating a drill separately from the operation of thehammer, as desired. In Figs. 8 and 9 a driving clutch member or sleeve37 is shown jonrnaled in bore 20 o fslceve 20 and provided at its innerend with clutch teeth 3'? to engage clutch teeth 24 on mem- The clutchteeth 14 and 37 areso spaced that member 2 may be in a neutral pc ltiontherebetween or may be shifted to tzfith 14 or to teeth 37 to causerotation 01" iub 1 s or sleeve 87. The member or sleeve 37 provided withgear teeth 38 in mesh with gear 39 carried by shaft 10 journaled insuitable bearings tl in casing 1. Shaft 40 is sho vn provided withmeans, comprising a spindle 4-2 and chuck L3, to receive a drill or tool44 (Fig. 8). rShaft lO and tool le are shown extendingin a directiondifierent from the plane of the hammer, so that one may be used withoutinterference by the other.

hen the hammer is to be used ti clutch teeth 1 2d, are engaged bypushing stem 26 inwardly for actuating cam member 7,

as before described, and the drill will not The construction describedis such that guide 5 may be removed as a unit from the hammer, thecasing and front plate, and said plate may be removed for access to cammember 7 which may be removed from crank-pin l3, and said pin may bewithdrawn from disk 14; through the front opening of the casing. Theworm 23 may be removed through the top opening of the casing, and theclutch member 2 1 may be removed through the rear opening of the casingafter the rear plate 4 has been removed. The disk 14 and its worm may beremoved through the front casing opening. The sleeve 20 may be removedwith one of the ball bearings 15 or 21 through the front or rear openingof the casing- The parts may be correspondin ly assembled in the casing.

My improvements provide a compact and strong tool, not liable to get outof order, and aifording improved means for actuating the hammer member 7ith minimum of friction and danger of breakage.

Changes may be made in the ments set forth without departing spirit ofmy invention.

Having now described my invention, what I claim is:

l. A power transmitting mechanism con prising a reciprocative memberprovided with a cam slot having curved spaced walls, a wall of said slotbeing movable, an eccentric pin operative in said .slot in cooperationwith said walls, said slot at the upper portion at the movable wallbeing of greater width than the diamenter of the pin to release thelatter, and means to actuate said pin, the said pin being operativeagainst a side and lower portion of the movable wall to cause retreat ofthe member.

A power transmitting mechanism comprising a reciprocative memberprovided with a cam slot, a roller journals-don said member, a portionof said roller forming part of the wall of said slot, said slot having acurved surface opposing the roller, .an eccentric pin operative in saidslot in cooperation with said roller, and means to actuate said pin, thesaid pin being located to successively engage a side and lower portionof the roller and said curved surface to reci rocate the member.

3. A power transmitting mechanism comprising a reciprocative memberprovided with a cam slot, a. roller journaled on said member, a portionof said roller forming part of the wall of said slot, the periphery 5fthe roller and a portion of the opposing surface of the slot being onsubstantially similar curves described around the axis of the roller, acrank-pin in said slot cooperative successively with a side and lowerportion of said roller and with said surface to reciprocate the member,and means-to rotate said pin, the upper portion of the slotreleasing thepin at the moment or" impact of the member.

a. A power transmitting mechanism comprising a reciprocative memberprovided with a cam slot, the member having a hammer, walls of theslot'being in the axis of the hammer, the outer portion of said slotbeing open through the member, a crankpin operative in said slot, theslot having a portion wiser than the pin to release the latter duringimpact of the hammer, and means to rotate said crank-pin.

5. A power transmitting mechanism comprising a casing, a reciprocativemember having parallel. side ed es and provided with a hammer, thecasing saving spaced rollers receiving and guiding said side edgestherebetween, a guide carried by the casing receiving and guiding saidhammer, and means to reciprocate said member and hammer.

6. A power transmitting mechanism coma casing, a reciprocative memberand hammer, means to guide said member and hammer, a disk having acrank-pin and a hub, the member having a cam-slot receiving said pin,said slot having a portion to release the pin during impact of themember a sleeve cooperative with said hub, means to operatively connectthe sleeve and hub, and means to rotate said sleeve.

7. A power transmitting mechanismcomprising a casing, a reciprocativemember and hammer, means to guide said member and hammer, a dish havinga crank-pin and a hu the member having a cam-slot re ceiving said pin,said slot having a portion to release the pin during impact of themember, a sleeve cooperative with said hub, means to operatively connectthe sleeve and hub, said sleeve having a worm wheel, and a worm meshingwith said wheel.

8. A power transmitting mechanism comprising a casing, a reciprocativemember and hammer, means to guide said member and hammer,a dish having acrank-pin and a hub, he memberhaving cam-slot receiving said pin, saidslot having a portion to release the pin during impact of the member, asleeve cooperative with said hub, a clutch member slidable in saidsleeve to cooperate with said hub, means connecting said sleeve withsaid clutch member to rotate the latter, and means to rotate saidsleeve.

9. A power transmitting mechanism c0n1 prising a casing, a reciprocativemember and hammer, means to guide said member and hammer, a disk havinga crank-pin and a hub, the member having a slot receiving said pin, asleeve cooperative with said hub, a clutch member slidable in saidsleeve to cooperate with said hub, a stud projecting from said clutchmember into a slot in the liO lit)

the sleeve, shifting; head rotatively united. to said clutch. member,said head having a stem proiccting' tarough the casing, and

said stein in different set 11. A power transm tin mechanism Dcomprising a casing, a reciprocative memher to operate a hammer, meansto reciprocate the member, a shaft separate from means to operate atool, gearing: and a motor to actuate said and tool, and means operativeto cause said gearing to actuate said means and tool separately.

12. A power transmitt lg rechanism comprising a casing, a reciprocativeme1nher to op rate a hammer, a sleev gearing and a motor to actuate saidsleeve, a second sleeve, a shaft to operate a tool, gearing be tweensaic second sleeve and shaft, and clutch means to cause the first namedsleeve to second actuate the hammer and one named sleeve separately.

13. A power transmitting mechanism comprising casing, a reciprocativemember to operate a hammer, a hub, means operative between the hub andsaid member to actuate the latter. a second sleeve, clutch means tooperate the hub and the second iamed sleeve separately by the firstnamed sleeve, a shaft tor a tool, and gearing be- 1 A power transmittingmechanism comprising a casing, a reciprocative member to operate ahammer, a sha' z't to operate a tool, a hub within said sleeve providedwith clutch teeth, means between said hub and member for operating thelatter by the former, a clutch member operative within said sleeve,means to rotate the clutch memher by said sleeve, a second sleeveoperative within the first named sleeve and having clutch teethcooperative with said lutch member, and gearing between said shaft andsale second named sleeve, said clutch memher being movable with relationto said clutch teeth to cause operation of said hub and the second namedsleeve separately.

15. A power transmitting mechanism comprising a casing, memberoperativein he casing to actuate a hammer, a shaft for a tool journaledin the casing at an to said member, a motor, gearing; to actuate saidmember and shaft, and clutch means to cause said gearing to actuate saidmember and said shaft separately.

16. A power transmitting mechan sm comprising a casing, a reciprocativemember provided with a cam slot and a hammer, the casing having guidingmeans for said member, a guide for the hammer entcnding from one side ofthe casing, a ro- 'Qi-JQ member within the casingand provided with acrank pin operative in said cam slot, a worm gear to actuate saidrotative member, a worm'in mesh with said and extending at an angle tothe axis aid rotative member, a motor and its casing attachec LO thefirst named casing on the side opposite said guide, means to rotativelyconnect said shaft and worm, and a handle on said motor casing.

' transmitting ii. A power iechanism comprising a reciprocative memberprovided with a recess located within one face of said member and havinga projection within said recess, a roller journaled' on said projectionwithin said recess and spaced from a wall or" said recess, said rollerand said wall forming a cam-slot, a crank-pin operative in said slotsuccessively against its said wall and the rol er, the cam-slot beingwider than the pin to release the pin for impact of the member, andmeans to rotate said cranli-pin.

Signed at New York city, in the county of New York and State of NewYork, this th day of Aprll, A. D. 1922.

JOSEPH C. BARRETT,

